How to set up a blueprint for locomotion for all root motion animations?

I’m having trouble figuring out how I can gain access to certain variables the character’s animation blueprint from the Character Blueprint - for instance - I set it up my locomotion - and I transition from idle to run through a speed variable…but seeing that with Root Motion your pawn doesn’t drive your animation - how do I get my "input axis in my character blueprint to affect my Anim blueprint’s speed variable - so make the character run?

Check out the 3rd Person tutorials on youtube. They go through the entire process step by step.